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8-, 5.25-, 3.5-, 2.5-, 1.8- and 1-inch HDDs, together with a ruler to show the length of platters and read-write heads A newer 2.5-inch (63.5 mm) 6,495 MB HDD compared to an older 5.25-inch full-height 110 MB HDD. IBM's first hard drive, the IBM 350, used a stack of fifty 24-inch platters and was of a size comparable to two large refrigerators.
A 3.5-inch USB/FireWire hard disk enclosure with cover removed. A disk enclosure is a specialized casing designed to hold and power hard disk drives or solid state drives while providing a mechanism to allow them to communicate to one or more separate computers.
Inner view of a 1998 Seagate HDD that used the Parallel ATA interface 2.5-inch SATA drive on top of 3.5-inch SATA drive, showing close-up of (7-pin) data and (15-pin) power connectors Current hard drives connect to a computer over one of several bus types, including parallel ATA , Serial ATA , SCSI , Serial Attached SCSI (SAS), and Fibre Channel .
Western Digital WD740GD 74 GB Raptor, a 10,000 rpm 3.5-inch HDD drive platter, Western Digital Caviar SE16 SATA 3.5-inch Hard Disk Drive. In 2001, Western Digital became the first manufacturer to offer mainstream ATA hard disk drives with 8 MiB of disk buffer. At that time, most desktop hard disk drives had 2 MB of buffer.
The SAS is a new generation serial communication protocol for devices designed to allow for much higher speed data transfers and is compatible with SATA. SAS uses a mechanically identical data and power connector to standard 3.5-inch SATA1/SATA2 HDDs, and many server-oriented SAS RAID controllers are also capable of addressing SATA hard drives.
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